Returning from home about a mile away and just fell out of the sky!
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every flight has the potential for disaster,all we can do as UAV pilots is to minimise those risks as much as possible we can do this by regular pre flight checks to make sure the UAV is airworthy, the batteries are fully charged, and when it comes time for take off ,that we give the RC time to aquire enough sats, that the compass is aligned correctly ,we have done a risk assessment of the surroundings where we intend to fly, and have checked that there are no airspace restictions in the area we intend to fly,i have a 5 million pound third party cover incase my UAV decides to plummet to earth and fly within the drone code after hundreds of flights i am still relieved when i can come home from a day out flying with my UAVs in one piece and no issues ,but sometimes a little fear is a good thing ,as being over confident can cause you to end up in situations out of your control,Thanks Old Man, my first drone was the Mavic Mini and I was always worried about it falling out of the sky because it was so small and that's what made me get the Mavic Air 2. In the end the Mavic Air 2 lasted less than the Mini.
Is there any way to feel fully confident and fear free when taking your drone out for a flight?
The only 2 things I can think of are to have drone insurance and attach a lightweight tracker of some kind.
This looks like a propulsion failure for a so far unknown reason ... either a prop or a motor. Decoding the initial pitch (goes positive), roll (goes negative) & yaw (goes CCW) directions suggests that it might have been the rear left that failed. If you share the mobile device .DAT log ending with FLY033.DAT we can have a look at the motor data.Returning from home about a mile away and just fell out of the sky!
DJI Flight Log Viewer | Phantom Help
Upload and view flight logs from your DJI droneswww.phantomhelp.com
This looks like a propulsion failure for a so far unknown reason ... either a prop or a motor. Decoding the initial pitch (goes positive), roll (goes negative) & yaw (goes CCW) directions suggests that it might have been the rear left that failed. If you share the mobile device .DAT log ending with FLY033.DAT we can have a look at the motor data.
View attachment 103274
Unfortunately the DAT conversion is missing most of the motor data, but it does include the pulse width modulation from which much can be inferred:Fascinating!
Well, here's that file (attached). I'm quite excited.
Poof!! it is done. But, you gotta be using the current version - 3.7.6. You should have seen this popupUnfortunately the DAT conversion is missing most of the motor data, but it does include the pulse width modulation from which much can be inferred:
View attachment 103300
Specifically, at 166.7 seconds the rear left ESC abruptly demanded full speed in response to craft control loss. That means that the rear left motor lost thrust, most likely due to prop loss but it could have been motor failure. That would require the motor speed data to determine and I'm sure it is in there somewhere - we just need @BudWalker to figure out why it is not appearing.
Poof!! it is done. But, you gotta be using the current version - 3.7.6. You should have seen this popup
View attachment 103354
Unfortunately, this popup won't appear if you've elected to not have CsvView/DatCon check for updates.
View attachment 103355
Anyway, the motor data shows the leftBack being commanded 100% and a current 3 times the other motors. It appears that is followed by a couple of seconds with no motor data being recorded. After that the leftBack speed is > 27K rpm. Not sure I believe that and it's odd that commanded, current and speed are all increased. An obstructed motor would cause current to increase and speed to decrease. And, a lost prop would result in lower current and higher speed.
View attachment 103353
To determine which quadrant has the lost propulsion I've started using the totalGyro data. Using the attitude data can be confusing sometimes.
View attachment 103357
Here it can be seen that the MA2 is rolling CCW, pitching up end over end, and rotating CCW. All consistent with the leftBack losing propulsion.
The .datCon file in your home directory should have a line that looks likeCurious - DatCon is set to check for updates and usually does announce, but not this time. I quit it and relaunched a few times, but no message.
Those are somewhat odd data from the rear left - I'll take a look. How much do we trust the motor current data from the newer models? I've noticed that the sum of the motor currents significantly exceeds the total battery current draw.
You're right. I'll fix that in the next version.......
EDIT: I just realized that "Check for updates on startup" was checked, but "Show when newer version is available" had somehow become unchecked. Fixed. So why two settings there - why check for updates you don't want to know the outcome?